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Thread: Uber-tight upper:lower fit, how to loosen?

  1. #31
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    The rear lug appears to be ok and fit right.

    My guess with all of this is that this entire batch of stupid is intentional on the part of the idiots at Baer.

    I don't want to use smaller pins, mod the pins, or anything else. The upper is the problem, the upper needs to be fixed or be trashed. I'll make attempts to reduce the size of the front lug first and go from there. I'm going to measure it and measure a bunch of other lugs to get an idea of how much is involved. Once that's resolved I'll look to the pin holes.

  2. #32
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    Quote Originally Posted by MistWolf View Post
    If the smaller pins are a bit loose in the lower, they'll cause wear in the holes of the lower.

    Yes this is true.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

  3. #33
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    Steel takedown pins always win when matched up against aluminum. The upper and lower eventually loosen.

    I'd ditch that upper, but slamming the upper and lower together with the front pivot pin in place a few times has been known to fix this issue. This was recommended by VLTOR when I was having a MUR fit issue.

  4. #34
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    If the upper and lower fit and you are certain the gun will function correctly and safely, just shoot the shit out of it. I have had this issue, but not as bad, with some of my builds and they all seemed to have loosened up after a few hundred rounds.
    Another option would be to send it back and tell them to un F*$K their upper or give you a new one.
    "Perfect Practice Makes Perfect"
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  5. #35
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    Quote Originally Posted by CoryCop25 View Post
    If the upper and lower fit and you are certain the gun will function correctly and safely, just shoot the shit out of it. I have had this issue, but not as bad, with some of my builds and they all seemed to have loosened up after a few hundred rounds.
    Another option would be to send it back and tell them to un F*$K their upper or give you a new one.


    All that does is put more wear on the in-spec parts at a faster rate.

    I would modify the upper by hand.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

  6. #36
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    Is the rear lug hole an oval or round on the right side? They are suppose to be an oval.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

  7. #37
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    Rob,

    Drive the pins in and out enough to see where the contact/ wear point is on the lug of the upper. Work it with a small file, or dremel if you need to work quicker and are sure of your mad skills. You already know to check it often and leave it a little tight so it will wear in.

    I've had to do this on one upper that was so bad I had to use a steel punch to get the pin in and out.
    Stick


    Board policy mandates I state that I shoot for BCM. I have also done work for 200 or so manufacturers within the firearm community. I am prior service, a full time LEO, firearm instructor, armorer, TL, martial arts instructor, and all around good guy.

    I also shoot and write for various publications. Let me know if you know cool secrets or have toys worthy of an article...


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  8. #38
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    My new PSA upper is still TIGHT on the rear pin on my DPMS 'factory' lower.. I use an allen-key to align (from opposing side) and tap lightly in with a jeweler weight hammer to get it in..

    Of course I think its slowly working IN.. I've only cleaned it like 6 times in 1000 rounds.. (or 4 range trips)

    I like the tight fit.. which I hear is better.. but if you got to BEAT them in all the time.. thats an issue.. a dowel with 220 grit may be your best friend.. IMHO..
    -----------------------------------------
    US Navy Vet. 1988-1992
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  9. #39
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    Quote Originally Posted by scottryan View Post
    Is the rear lug hole an oval or round on the right side? They are suppose to be an oval.
    No, it is round. Finally just got the calipers on it. It's .245" ID.

    Interestingly the pin fits tighter in the rear hole but the front lug is the fat one. Pivot pin hole is .248" ID.

    FWIW, in most lowers I've now tried this in I cannot even pound the pins in without a rubber mallet, so this is nowhere near normal tight.

    Front, pivot, lug is 0.505" wide, rear is 0.50" wide.
    Last edited by rob_s; 08-26-11 at 18:32.

  10. #40
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    Rob

    Have you tried contacting Baer? Maybe they can exchange it for another one. I had an upper receiver from BCM that was uber tight as well. It was tight on Colt, LMT, and my Noveske lower. I emailed Paul and he exchanged without question. Got a new one and I drove on. Just a thought.

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